1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
|
if {0} {
/*
* This file is part of din.
*
* din is copyright (c) 2006 - 2012 S Jagannathan <jag@dinisnoise.org>
* For more information, please visit http://dinisnoise.org
*
* din is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* din is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License along
* with din. If not, see <http://www.gnu.org/licenses/>.
*
*/
}
set start $timenow
;# defaults
set duration 5 ;# change every 5 seconds
set changes {+5 -5} ;# change key up a 5th then down a 5th ie back to tonic
set index -1
proc loop {} { ;# called once per audio loop
global timenow start
global changes duration
global index
if {($timenow - $start) > $duration} { ;# time to change
set len [llength $changes]
incr index
if {$index >= $len} {
set index 0
}
set change [lindex $changes $index] ;# pick the index'th change
set dir [string index $change 0] ;# what is the direction? + is go up, - is go down
set amount [string range $change 1 end] ;# amount to change - this is interval variable defined in din
global $amount ;# interval variables are defined in global namespace
if {$dir eq "+"} { ;# change up
key [expr [key value] * [set $amount]] ;# changed key
} elseif {$dir eq "-"} { ;# change down
set val [set $amount]
if {$val != 0} { ;# to avoid / by 0
key [expr [key value] / [set $amount]] ;# changed key
}
}
set start $timenow ;# prep for next change
echo "changed by $dir$amount to reach [key value] hz / [key note]" ;# inform key change to user
}
}
|
